Incandescent-lamp socket.



P. KLEBBR.

INGANDESGENT LAMP SOCKET. APPLICATION FILED JULY 12, 1909.

Patented Jan. 30, 1912.

ATTORNEI entree erases earner caries.

PETER KLEBER, OF WIESBADEN, GERMANY, ASSIGNOR OF ONE-HALF TO HENRY ZIRWAS, 0F YONKERS, NEW YORK.

INGANDESCENT-LAMP SOCKET.

T 0 all whom it may concern:

lle it known that 1, PETER Kinsman, a subjectv of the King of Prussia, and resident of lViesbaden, in the Province of Hesse-Nassau and State of Prussia, Germany, have invented certain new and useful Improvements in Incandescent-Lamp Sockets, of which the following is a specification.

My invention relates to sockets tor incandescent lamps.

It relates particularly to anew and improred socket in which the shell holding the insulation is formed in two parts, one of said parts, the outer, being provided with two screwthreads, the upper thread screwing onto the cap, and the lower thread receiving internally the second screw threaded insulated shell portion.

It relates further to a socket, in which a glass, or similar cup, permanently fixed to the lower shell portion, terms the insulation between the shell and the current carrying parts of the socket.

The object of the invention is to produce a simple, solidly constructed socket, which shall render contact with or short circuiting of the current conducting portions practically impossible, and which shall be cheaply made. easily mounted and demounted, while doing away with all the fragile members found in many constructions of sockets.

Moreover, a further object is to provide a socket which, when put together shall so solidly and firmly hold the various parts that unintentional displacement, unscrewing or dropping out becomes practically impossible, even under the roughest treatment.

In the drawings accompanying and forming part of this application: Figure 1 is a longitudinal section through the socket and attached cup and shade. Fig. 2 is a crosssection on line a.'a2, of Fig. 1, and Fig. 3 shows a side elevation of a similar socket with a modified form of insulating cup.

Referring to the drawing 2-1 is the usual cap provided with the ordinary nipple through which the conductors pass, andhaving also a screw-thread tor attachment to the shell.

2 is the outer socket shell, divided into two screw-threaded portions, the upper portion 3 screwing into the cap, the lower screwthread serving partially as a setthread,

Specification of Letters Patent.

Application filed July 12, 1909.

Patented Jan. 3%,1912.

Serial No. 507,057.

engaged internally by the inner screwthreaded shell portion 5.

6 is the ordinary lamp screw attached to the base of an insulating material 7. Per manently attached to the inner screw threaded shell portion 5 is an insulating cup 8, for decorative and other reasons preterably made of glass.

10 are the circuit terminals secured to the insulating base 7, one being connected with the lamp thread 6, and the other with the spring contact 11. against which screws the upper lamp contact.

The insulating cup 8 is provided on the lower part of its neck with a projecting collar 12, over and about which is bent the lower edge of the inner shell 5. This screwthreaded inner shell, portion 5 is perinanently att. lied to the outside of the cup neck, secured against loosening, and is, preterably, bent partly over the upper edge of the cup neck, as shown in the drawing. Itv is evident that the cup itself could be screwthrea'ded, and serve the same purpose, but metal thr ads are more durable and more easily manipulated than those cut in brittle materials.

' Inter-posed between the insulating cup neck and the insulating base 7 is an elastic. packingt), for insuring an air tight and current sate joint between cup 8 and the insulating base 7. For the purpose of a firmer hold, the abutting faces of the cup and base are pretcral'ily roughened. On the lower circumference of the insulating base 7 is a projecting collar 14. against which screws, at the top, the thread of cap 1, and the under side ot'.'\\'lii(:l1 engages the inward spring collar 15, formed by a thread of the shell portion 2. Between the lower end of the shell part 41 and the projection formed by the shoulder 12. of the insulating cup 8, and seated on an elastic ring 16 or similar device. can be fixed, a shade 17, rigidly clamped by screwing together the inner and outer slell portions of the socket. It is evi dent that it tl e cup has cut into it the inner shell thread, it can form the shade holder.

The construction and setting up of my socket is extremely simple. By rolling, the thread is formed on the cap.- The outer shell. 2 is also rolled with two threads, an upper one :3,tor engaging the screw-thread although, of course, the lamp can "rule firmly roughened sol-'- cup 8, assures l the two, and t1 spring collar 35, sulating' hose desired to atia 1 i on the projeetion I or the inner shell, when tions are c (linar y (lonhle all 'l he lower :1 base 7 is le'lft lerel, i ing the insulating; which would nitprojections, thickness of the that, on screwing it irn rest ag inst the terminals 153, and as;

For the insulatino woo rally preferred, hecar of decorative ellerl's can ie new while it answers pcrl purpose ol. insulating lroin the outer shell insulating material only .iat its shape may. he \aried \\'ilh in wide limits.

r {glance at the c there ohlaiued, in the the most perl'el: metal portions 2 the more practical in electric terminals Vim-lead ol 7 is held in place, including the or if), prevents its falling out or oose, even if the insiiilating cup len'nne changed, without disturbing any pa the socket, or their relation to eaeh lily this method of fastening of the ii: ing cup there is overcome the detects ll cut in former sockets, in which the inso ing ring easily worked looee, fell out, e was not replaced by the coneuu'ier. shape of the insulating" cup, inorcca a lows of using any kind of carbon or mere lic filau'ienlz lamps. The present socket; therefore, to be regarded as porcelain socket, in which contact with current ing terminals, on inserting the lamp into the socket, is just as impossible short circuit to the socket shell, and a socket: in which the screw terminals on the bottom t1. the insulating base are doubly insulated Having thus fully described and illnetrated my invention, What- I claim is:

1. In an incandescent lamp soclr t, a screw-tln'eaderl cap, a shell composed 0" 1 members, an outer and an inner menthol, outer shell member having ttvo r threads, the upper one engaging the screw on the cap, in combination with. cup formed of insulating material having li ctlly attached thereto the inner screw-tin ed shell member engaging'the lower ti on the outer shell member, substantial set forth.

2. In an incandescent lamp soc; serewthreadctl cap, a shell. formed in members, an inner and an outer memhe. outer shell n'iemher having two threads, the upper thread engagii" tile screw threaded cap, in combination wi 11 an Silo insulated inner shell member engaging the substantially as set forth.

3. in an inemn'leseenl; lamp socket, the eomhination of a screw-tzln'czulerl 'ap, a shell composed of two separate members, an outer and an .inner, the outer shell member pro \idod with two scre\\'-thi.'ca ls, the upper one of which engages the cap thread, in c m1hiual1ion with an ornanurnl'ai ty cup provided with the inner shell uujauher and. supported within the lower outer shell screw, substantially as set :torth.

lain an incandescent lamp socket, the

combination of a SCl'lJJ'l lll'tlltlitfll cap, an in 1 5 whiting hose lying); within Sa'd cap, an out war-(li y projecting collar on said base, in rmnhiualiou with an outer shell member j hating an inwardly projovling epringz; collar 1 engaging: the collar on the insulating bas f gi l lllyih insu ai land held lirlnly within the cup, substans pggllll me lame,

lially as net; l'orth.

5. lo an H) :undoscont lamp Socket, a iw threaded cap, an msolalnur haw v22)- H vim r. l l

l therein and having; a, proje ting voila; ww

resting against the end of the cap screw, an outer shell member carrying two screw threads, an inwardly projecting spring shoulder formed between the two outer shell screws, said spring shoulder engaging the under portion of the cap collar, in combination with an insulated inner shell thread engaging the under thread of the outer shell member, substantially as set forth.

6 In an incandescent lamp socket, a shell omposed of two members, an outer and an iner, the outer member having two screw needs, a screw-threaded cap engaged by the upper screw of the outer member, the outer shell member having a bead and being screw-threaded and insulated, in combination with a shade rigidly clamped between the lower end of the outer threaded shell and the bead on the inner threaded shell.

Signed at Niesbaden, Germany, in the Province of Hesse-Nassau and State of Prussia this 29th day ofJune A. D. 1909. 4 PETER KLEBER. Witnesses HERMANN PLIsomsE,

MAX Freeman. 

